Improvement in devices for setting, jointing, and gaging saw-teeth



t L. H. BIGELOW. Device for Setting, Jointing, and Gaging Saw-Teeth No.219,438. Patented Sept. 9,1879.

ATTORNEYv WITNESSES Q/%7?;TOR

N.FEIER$. PHOTO-LITuOGRAPNEk, WASHINGTON. D, '0.

UNITED STATES PATENT Futon.

LEVI H. BIGELOW, OF FREMONT CENTRE, MICHIGAN.

IMPROVEMENT IN DEVICES FOR SETTING, JQINTING, AND GAGING SAW-TEETH.

Specification forming part of Letters Patent No. 219,438, datedSeptember 9, 1879; application filed June 7,

To all whom it may concern:

Be it known that I, LEVI H. BIGELOW, of Fremont Centre, State ofMichigan, have invented a new and valuable Improvement in Devices forSetting, Jointing, and Gaging Saw-Teeth; and I do hereby declare thatthe following is a full; clear, and exact description of theconstruction and operation of the same, reference being bad to theannexed drawings, making a part of this specification, and to theletters and figures of reference marked thereon.

Figure 1 of the drawings is a representation of a side view of myinvention. Fig. 2 is a plan view thereof. Fig. 3 is a transverse sectionof the same, and Fig. 4 is a detailed view of the gage-plate. Fig. 5 isa view of the flanged side of the plate.

This invention has relation to means for setting, jointing, and gagingsaw-teeth, being an improvement on the instrument for which LettersPatent were granted to me May 8, 1877, and consisting, mainly, inthe'general form of the body-plate, omitting therecesses between theflange and body; in the offsets of the gageplate, whereby it is renderedreversible in the form of the setting-slots, whereby they are providedwith lateral extensions or recesses at the inner ends to receive thepoints of the teeth and protect them, and in the adjustable screwarranged in a recess atthe bottom of the plate for gaging the set andthe set-screws of the file-groove, all as hereinafter shown anddescribed.

In the accompanying drawings, the letter A represents an oblongrectangular plate, made of metal, and having a projecting rib or flange,B, extending along one of its edges, the face of which is thereby madebroader, said rib being at right angles with the body portion of theplate and at about the middle portion of the rib B, below which is adepending brace portion or lug, O, supporting the central recessedportion of the rib and forming the floor of the recess. This lug isslotted longitudinally at 01, next the body-plate, and is provided ateach end of its upper surface with interior ways to receive the ends ofthe gage-plate.

On each side of thedepending lug the flange is thin, being rabbeted, sothat its lower face is above the gage-plate in the central recess abovethe log 0. By using the rabbeted ends G I am enabled to use thegage-plate for the clearing-teeth on saws which have their teethdifferently spaced.

D represents the gage'plate, which has its side edge tapering, so thatit will be held in place against the action of the file. This plate isprovided with a slot, (1, coinciding with the slot of the centerlug, (l,and is also made with ofi'sets c at each end on one side.

As the clearing-teeth are turned toward the rabbeted portion of theflange C, it is apparent that they can be filed down shorter than thecutting-teeth, and that by reversing the gageplate D their length can bemade still shorter, as is required in saws for cutting softtimber, theclearin g-teeth for hard tim her being longer.

In the opposite side of the plate A is the longitudinal file-groove E,into which project the set-screws f, whereby I he fileis held steadilyand firmly with its surface at right angles with that of the body of theplate, so that the ends of the teeth can be evenly jointed. The surfaceof the plate at h, next the file-groove, is somewhat beveled, so thatthe set of the teeth of the saw will not be disturbed in the filingoperation.

G G G refer to setting-slots of d fferent thicknesses, each slot havingat its inner end a lateral enlargement or toe, k, which receive thepoint of the tooth and prevent it from being bent or injured in thesetting operation, which is very important, as otherwise the tooth wouldwork with difficulty and the efficiency of the saw be impaired.

In the lower edge of the body portion of the plate A is madearectangular recess or notch, g, in the bottom of which is set a screw,g, which serves to measure the set of each tooth, as it can be adjustedto the set required for the saw, and each tooth of the saw can be triedagainst it, as shown in Fig. 5, until its set is correct. Havingexplained this invention, what I claim, and desire to secure by LettersPatent, is-

l. The flanged jointing-plate A, having the central depending slottedlug O and the rabbeted flange ends G on each side thereof, in

combination with the slotted gage-plate I),

substantially as specified.

2; The combination, with the flanged joint in g-plate A, having theslide'recess B, of the reversible gage-plate D, having at its ends onone side the offsets e 0, whereby a jointinggage for clearing-teeth ofdifferent lengths is formed, substantially as specified.

3. In the plate A, the setting; gage recess g, having the adjustablescrew 9, for gaging the set of the teeth uniformly, substantially asspecified. 4

4. In the jointing-plate A, the file-groove E, in combination withtheelamp-screwsf, Where by the file is firmly secured at right angles tothe body of the plate, substantially as specified.

g, and adjustable gage-screw g, and the fileclamp screws f,substantially as specified.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two Witnesses.

LEVI H. BIGELOW.

Witnesses:

EUGENE W. FORTUNE, GEORGE TAITE.

